<template>
  <!-- 商品分类导航  事件的委托把全部商品和索引值放到一起-->
  <div class="type-nav">
    <div class="container">
      <div @mouseleave="leaveShow" @mouseenter="enterShow">
        <h2 class="all">全部商品分类</h2>
        <!-- 三级联动-->
        <transition name="sort">
          <div class="sort" v-show="show">
            <div class="all-sort-list2" @click="goSearch">
              <div
                class="item"
                v-for="(c1, index) in categoryList"
                :key="c1.categoryId"
                :class="{ cur: currentIndex == index }"
              >
                <h3 @mouseenter="changeIndex(index)">
                  <a
                    :data-categoryName="c1.categoryName"
                    :data-category1Id="c1.categoryId"
                    >{{ c1.categoryName }}</a
                  >
                </h3>
                <!-- 二级三级分类，最开始的时候通过样式，display：block none来实现二三级显示,通过js来显示二三级标题，样式也可以-->
                <div
                  class="item-list clearfix"
                  :style="{ display: currentIndex == index ? 'block' : 'none' }"
                >
                  <div
                    class="subitem"
                    v-for="(c2, index) in c1.categoryChild"
                    :key="c2.categoryId"
                  >
                    <dl class="fore">
                      <dt>
                        <a
                          :data-categoryName="c2.categoryName"
                          :data-category2Id="c2.categoryId"
                          >{{ c2.categoryName }}</a
                        >
                      </dt>
                      <dd>
                        <em
                          v-for="(c3, index) in c2.categoryChild"
                          :key="c3.categoryId"
                        >
                          <a
                            :data-categoryName="c3.categoryName"
                            :data-category3Id="c3.categoryId"
                            >{{ c3.categoryName }}</a
                          >
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>

<script>
import _ from "lodash";

export default {
  name: "TypeNav",
  data() {
    return {
      categoryList: [],
      // 用户移上哪一个一级分类
      currentIndex: -1,
      show: true
    };
  },
  created() {
    this.getCategoryList();
  },
  // 组件挂载完毕向服务端发送请求
  // mounted(){
  //   // 通知Vuex发请求，获取数据，存储于仓库中
  //   this.$store.dispatch('categoryList')
  // },
  mounted() {
    if (this.$route.path != "/home") {
      this.show = false;
    }
  },
  methods: {
    async getCategoryList() {
      const { data: res } = await this.$http.get("product/getBaseCategoryList");
      this.categoryList = res.data; //存入到data中的rightsList
      console.log(this.categoryList);
    },
    // 鼠标进入修改响应试数据currentIndex属性
    // changeIndex(index) {
    // 鼠标移到一级分类的索引值
    // 正常情况用户慢慢来都会触发那几个一级事件，操作很快也应该触发16个
    // this.currentIndex = index;
    // },
    // 鼠标移出的回调
    // leaveIndex() {
    //   this.currentIndex = -1;
    // },
    changeIndex: _.throttle(function(index) {
      this.currentIndex = index;
    }, 50),
    goSearch() {
      // 事件的委派，怎么确定点击的是谁，包括是第几级标签
      // 在a标签中加自定义属性
      // 获取到当前触发事件的节点
      let element = event.target;
      let {
        categoryname,
        category1id,
        category2id,
        category3id
      } = element.dataset;
      // 如果标签身上带有categoryname的属性就是a标签
      if (categoryname) {
        // 整理路由跳转的参数
        let location = { name: "search" };
        let query = { categoryName: categoryname };
        // 一级分类，二级分类，三级分类
        if (category1id) {
          query.category1Id = category1id;
        } else if (category2id) {
          query.category2Id = category2id;
        } else {
          query.category3Id = category3id;
        }
        // 判断路由参数中有没有带params参数，有的话给带过去,因为两种参数只能传一种要添加
        if(this.$route.params){
          location.query = this.$route.params;
          // 整理参数
        location.query = query;
        // 路由的跳转
        this.$router.push(location);
        }
      }
    },
    // 当鼠标移入的时候商品分类列表显示
    enterShow() {
      this.show = true;
      // 只有是home页面才会是显示
      // if (this.$route.path != "/home") {
      //   this.show = true;
      // }
    },
    // 鼠标离开的时候，商品列表进行隐藏
    leaveShow() {
      this.currentIndex = -1;

      // 判断如果是Search路由组件的时候才会执行,因为要先判断路由
      if (this.$route.path != "/home") {
        this.show = false;
      }
    }
  }
};
</script>
<style scoped lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }
        }
        .cur {
          background-color: skyblue;
        }
        .cur1 {
          color: skyblue;
        }
      }
    }
    //过度动画的样式(进入的开始状态)
    .sort-enter {
      height: 0px;
    }
    .sort-enter-to {
      height: 461px;
    }
    // 定义的时间
    .sort-enter-active {
      transition: all 0.5s linear;
    }
  }
}
</style>
